<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>视网膜图片适配</title>
	<style type="text/css">
		.retina_pic{
			width: 300px;
			height: 215px;
		}
	</style>
</head>
<body>
	<img src="../images/pic1x.jpg" alt="一般屏幕">
	<img src="../images/pic2x.jpg" alt="二倍屏-适配" class="retina_pic">
</body>
</html>